Let's just say that your graphic card is really weak for gaming on either of those resolutions, if you're looking for good settings. I would say medium at most. But that would also depend on games you're playing. For movies, it would be fine.

What you can do, if were considering on spending $400+ on a single monitor, is buy the 22", and use the rest on upgrading your parts, like the graphic card, motherboard, and CPU. Or sell your system, and rebuild from scratch.

Are you getting the monitor used or what? Cause 250 for a 24" monitor is a STEAL. The cheapest monitor ive found is 299 for the one from compusa. But, if you can afford it, go with the 24", just know that you it will require more video power than the 22" would. I love my 24", but im running an SLI setup to push the pixels.